Fix as confluent documentation default value (#4549)

Author: carlesarnal

docs/modules/ROOT/partials/getting-started/ref-registry-serdes-config-props.adoc

@@ -197,7 +197,7 @@ The `DefaultSchemaResolver` uses the following properties to configure how artif
 |`apicurio.registry.as-confluent`
 |Used by serializers and deserializers. Shortcut for enabling the legacy Confluent-compatible implementation of `IdHandler`. Only used if `apicurio.registry.headers.enabled` is set to `false`.
 |`boolean`
-|`true`
+|`false`
 |===
 
 [discrete]